Sanding machine



A. LOUCONY ET AL 2,43,359

SANDING MACHINE Sept 27, 1949.

2 Sheets-Sheet l Filed June 15, 1946 INVENTORS Harfiz 5110K {ldoZp/ze Laucany B AZZ'ORNE X5 Sept 7, 1949. A. LOUCONY ET AL 2,483,369

SANDING MACHINE Filed June 15, 1946 2 Sheets-Sheet 2 w w mw A TTORNE'Y-S' Patented Sept. 27, 1949 UNITED. STATES" TENT oer-ice;

SANDING MAQHINE.

penter Manufactiiringo Company, Bridgeport, Conn acorporationiof Connecticut.

App i i n June 5,

8 Claims. 1:.

This invention relates to stationary sanding machines.

An=object--ofthe invention is to-providean improved stationary sanding machine which has wideapplicationand may be used in finishing variousperpendicular and-'angularly located surfaces of both large and-small workpieces.

Another. object of the invention is to provide a sanding machine-as above,- which is extremely simple in construction and economical to manuvfacture.

Still another. object ofthe-inventionis to pro: vid. a sanding machine of: the above type which is convenient touse, and in which theabrading elements of. sandpaper, emery cloth. and the" like may be quickly. and easily replaced. when worn out.

In accomplishing. the above objects there is. plDVidGdby the invention a machine comprising a. base having a, rotatably mounted horizontal shaft. which extends; across the top:.thereof;. A.

novel; sanding element i s.- carried by the shaft. within the confines of.- the base, thesaidi element.

comprising; a rotary drum. having simple and, improved means. for securing to. it. an. encompassingsheet. of; sandpaper or the like. Cooper,-. ble-W ththe drum. is a larg fl work. rest,,i1.1; the form of a table, whichispivotally mounted. n. tha chf e as and h h hasa transverse; slot throughjwhich. the sanding drum ex; tends. By the use of simple and novel means which, are provided for. manually raising or low eringgthe table with a micro movement and forlocking it. in any adjusted position, workpieces which are fed along thetable over the sanding drum may begiven a very accurate and fine finish.v

For-finishing, surfaces of smaller area,wl1ether;- these be perpendicular orangularly located,

means.- are provided at one; end of theshait in.-. cludi-ngasanding disk andincluding a novel-Work rest inthe form of a tiltably mounted plate ex tending across the face of the. disk and; carrying an, angularly. adjustable slide-or mitre head. The work-rest plate is secured-"to the base ofthe machine-by a simple pivotal mounting, and; has means cooperable with the base for enabling adjustment of th plate, and: for locking the lattes invarious angularpositions.

Theorganization as provided. by the invention issuch that sanding operationsmay-be performed; on. a large variety;- of-. workpieces having. eithen s uaped; or angularl located: surfaces. to. be. fill: ished. Also..- certain; concave and convex sur-v faces; mayrbeereadily. finished. by use of the, ma.-.

1946, Sjerialhj'o, 677,053

chine, the particular sizes suitable for finishing being limited by the diameter ofthe sanding drum= Inclicia are provided--- in connection with thework g-uidesto enable-the angularity of the surface-beingfinished to be read directly, or-tobe readily computed.

Other, features and advantages. will; hereinafter appear.

In .the accompanying drawings:

Figure. 1. is a top. orplan. view ofthe sanding machineofthe invention.

211s a front. elevation. of the machine, a portion. frthe work tablebeingbroken away and. shown in section. to. reveal. the cross-sectional.

shape,

Fig. 3..is.a.side.view ofthe machine, partly in. elevation. and. partly in section, on. the line. 3.73-- oil fig. 1...

Fig. 4; is a, vertical; sectionv taken on the line. 4:41. of: Fi -..but; with the. sanding dr F01. ai ed: o. h t. th lamp means is n o l a. ia men ar se tion of, the sanding ra ake ontheline .of;

l a s airasmen ary e tion n he i e -6.;

F .1. 7 s a i e i w a tly. at n and.

. artly; n; se n: f. the ableus in ma h:

" Fig 8;is. a section on the line 8--8- of. Fig, 7.

Referring to Figs. 1, and 2, the improved stationary; sanding machine of this invention com,- prises. an upright base or pedestal ill which is preferably formed of a metal casting, the. base. 5 having at. its. rear portion backwardly projecting lugs or cars ll. carrying a cylindrical pivot. bar [2. The bar. it, passes. through and supports lugs. l3. depending from a large fiat work rest or'talole l4, thelatte'rbeing thereb mounted for 40 pivotal raising or lowering movement on the base. Axial shifting of the pivot bar is pro-,' vented, by. spring retainer rings l2 Fig. 1, which are accommodated in annular grooves provided'for the purpose.

At its top the base Ii! rotatably carries a horizontal shaft 'orspindle !-5, the latter being mounted in anti-friction bearings l6 secured; in oppositeside walls I! of the base, Figs. 1-, 2-and 4, and being driven through a pulley I504 securedon thespindleadjacent one end thereof.

In. accordance with theinvention a novel-sandingdrum I 8.=is,.providedon the spindle l5 betweenthe. antiefriction bearings. l6 thereof, the said drum projectingupward through a laterallyextending. slot laprovided in the table I 4.

As shown in Figs. 4 and 5, the drum 18 comprises a cylinder 2!] rolled of sheet metal, the adjacent edges 2| of the cylinder being spaced from each other and being joined to flanges 22 of a metal channel strip 23, the latter having side walls 24 and a bottom wall 25 all located within the cylinder. The flanges 22 of the channel strip can be joined to the cylinder edges 2| in any suitable manner, as by riveting, spot welding etc., although the latter method is at present preferred.

By this construction a longitudinal recess 26 is provided in the drum 22, the said recess being defined by the Walls 24 and 25 of the channel strip 23. The recess 26 serves to accommodate clamping means for securing in place the edges 21 of a sheet of sandpaper 23 wrapped around the drum 20, the said means comprising an outer clamping strip 29 and an inner channel-shaped clamping strip 30, both strips extending for the full length of the recess 26.

The inner clamping strip 30 has outwardly extending flanges 31 along its edges, provided for the purpose of engaging inwardly offset portions 32 of the flanges 22 of the channel strip 23'. By such engagement, the clamping strip 30 is predeterminedly located in the recess 26 in an operative clamping position adapted for securely holding the edges 21 of the sandpaper 28. The outer clamping strip 29 has longitudinally extending shoulders 33 on the inside along the opposite side edges, the said shoulders being cooperable with the flanges 31 of the inner clamping strip to securely grip the edges '21 of the sandpaper and clamp the latter to the cylinder 20.

A novel operation is provided in clamping the edges of the sandpaper 28' by the provision of resilient means engageable with the clamping strips 29 and 30, the said means being in the form of compression springs 34 and 35 located respectively between the strips 30 and 23, and the strips 29 and 3B. The springs 34 and 35 are preferably carried on the shanks of clamping screws 36 which pass through the clamping strips 29 and 30 and are countersunk in the outer strips 29. The clamping screws 36 are threaded into square nuts 31 which are located along the bottom wall 25 of the channel strip 23 and are secured against outward movement therefrom by fingers 38 lanced from the side walls 24 of the strip, Figs. and 6.

A plurality of clamping screws 36, and a plurality of springs 34 and 35 may be provided on the drum l8, located both at the ends of the drum as shown in Fig. 4, and intermediate the said ends.

As clearly shown in Fig. 5, the springs 34 are heavier and therefore stronger than the springs 35, and thus the clamping structure operates in a novel manner to enable replacement of the sandpaper 28 to be quickly and conveniently made. In accomplishing such replacement, the clamping screws 36 are fully loosened, each approximately an equal amount. During the initial movement of such loosening, the clamping strips 29 and 30 will remain together and will be moved simultaneously outwardly of the recess to a certain degree.

This action occurs due to the compression springs 34 being heavier and stronger than the springs 35 and therefore expanding prior to expansion of the latter springs. As the loosening of the screws 36 is continued, the springs 34 attain their free length, causing the clamping strips 29 and 39 to be held in an outward position in the recess 26, and the springs 35 then expand and cause separation of the clamping strips so as to release the edges 21 of the sandpaper. It should be noted that the release of the sandpaper is effected without the screws 36 being entirely removed from the nuts 31, so that the entire clamping assembly is merely loosened and does not come apart.

Upon the sandpaper 28 being released, it may be easily removed from the drum and a fresh piece of sandpaper quickly inserted in the following manner: One edge of the sandpaper is inserted between the clamping strips 29 and 30, the paper wrapped around the cylinder 22, and then the other edge inserted between the clamping strips. While the sandpaper is being held tightly in place around the cylinder with one hand, the screws 36 are tightened equal amounts at a time by a screwdriver held in the other hand. During the initial tightening movement of the screws 36 the springs 35 will be compressed and the clamping strips 29 and 30 brought together. This causes the edges 2'! of the new sheet of sandpaper to be gripped with a fairly substantial pressure. It will be noted that, by the provision of a central web 39 extending along the inside of the outer clamping strip 29 the edges 21 of the sandpaper are caused to be folded, thereby causing a better retention of the sandpaper edges during the installation of the paper, and also during operation of the machine.

As the screws 36 are driven further into the drum ill, the strips 29 and 30, which are now together and securely holding the edges 21 of the sandpaper, are forced simultaneously deeper into the recess 26 of the drum, causing a compression of the springs 34. By this action the clamping strips will carry the edges 21 of the sandpaper with them into the drum recess 26 and cause the sandpaper to be tightly pulled and wrapped around the said drum. As the screws 36 are finally tightened the flanges 3i of the inner clamping strip will engage the offset portions 32 of the channel strip 23, and the shoulders 33 of the outer clamping strip will secure the edges 21 of the sandpaper against the flanges 3i A positive gripping of the sandpaper is thus accomplished, so that the latter under no circumstances becomes loose from the drum l8 during use.

The sheet metal cylinder 20 is secured to the spindle 15 by end disks 46, Figs. 4 and 5, the said disks having peripheral shoulders 41 for engaging and positioning the cylinder ends. The disks 4% are held against rotation on the spindle 15 by suitable set screws 42 which may be spotted into the spindle to effect a positive lock.

In accordance with the invention the mounting disks 4B are provided with counterweights 43 located diametrically opposite the recess 26 in the drum l3, and by this organization the weight of the clamping means in the recess 26 is compensated for, so that the drum I 8 is dynamically balanced.

For the purpose of adjustably raising or lowering the table I 4 with respect to the sanding drum 18 the invention provides a simple and novel adjusting and locking mechanism. This mechanism comprises a lug 44 on the front wall 45 of the base 10, the said lug carrying a stud 46 which passes horizontally therethrough and is locked against turning by a shoulder 44a engaging the head 46a of the stud. At its end the stud 46 is threaded to be received in a manually operable clamping nut 41. The stud 46 also carries a compression spring 48, and between the spring 48 and the nut 41 a cam lever 49 is located, having a camoutages bring l ortiontn ior engagement with an-nudes sur tace 54 of the table =14. Betweenithe lug M of the base l fl and-thecam'ilever dil 1a, bifurcated-lug. 52- extends, the said lluglaeing rintegral with the table l 11 :and dependent therefrom.

7 Referring to Fig; 8 when thezmanually operable nut 4 1- is tightened with the llug5 2mf the table M. in the position :the side :of the lever 49 clamp the 2 therefore hold the table M-in "Whenit :is desired to raise sor lowerthe were in; mit 43 loosened, whereupon (cam letter 4 9 maybe moved either torwardor backward, pausing the' cam portion thereof toraise OI'RIOYIBI' dihe'table. After the desired setting is found, tighitching of the nut 41 again clamp the ilug fihof the table ands-hold the latter securely :in the newly radjustedzposition. It will be noted that, upon ilooseriingoi the nut-'41., the compression spring themes to separate the lever 49 from the :base lug #0, thereby efiecting-a positive release orf the log 52 :of table.

Under certain circumstances it may be desirable .to use the sanding 18 without benefit of the table 1-4, aa'rrdiaccomdinglythe table may be swung upward and backward about the pivot .bar 1.2 after thenut Mira-s first been rloosened. The table -|4 can :swing an angle :greater than ninety degrees :so that fit is held by its weight in the raised; inoperative position. At the time that the table is againiowered, it will be found that the spring Adholds the cam lever '49 separated-from the base lug M, so that the lug 52 of the table is readily interposed :betw-Jeen the base lug and :cam lever withoutrinterference.

Referring to Fig. 5;, when the clamping strips 29 and--30 are, forced into the recessfii of the drum to hold the sandpaper securely in place, the outer surface 530i the @elamping ship as is located so as to lie substantialty in the-cylindrical surface defined by the sandpaper and as shown, this surface 53 is madeoonvex ior-thisgpurpose.

We have round that,according to the organization as provided :above, workpieces be accurately sanded and finished by resting them -on the table l4 and passing them overthe rotating sanding disk 48. Accordingto the amount of finishing which has to be done, the table Hmasrbe raised 'or lowered' minu-te amounts by the cam lever 49, and the relationship between the top surface of the table and the drum 18 may be accurately determinedand-held. By having the drum I8 project only slightly above the table l4, and using fine sandpaper'on the drum, very fine and accurate finishing of a workpiece maybe accomplished.- By applying a coarser sandpaper to the drum l8 and lowering the table 141K318. greater extent, a deeper finishing cut may be taken and the coarser finishing operations readily performed.

Where workpieces havesur'faces which -cannot be readily finished "by 'use'oI the sanding drum 1.8, as 'ior 'instance surfaces having a precise angular'relation with respect to adiacent intersecting surfaces, such finishing may,-however.,- still be accomplished w'iththe machineoi -this invention. Referring to Figs, 1 and 12,; one end of the'spindle l5 has mounted thereon an accurately aligned sanding Wheel or disk 54 having secured to its outer faceasandpaper disk 55.

Cooperable with the sandin disk 54 is a work rest comprising a flat plate 56 which is tiltably mounted on the base l0 and which carries an angularly adjustable miter head 51 mounted on a slide bar 58.

Simple and economical-to-manufacture means 6 are provided for tiltably mounting the work rest 56.; the :said means comprising a lateral extension 59=at one corner-of the work rest, carrying a pivot pin 60 which is received in a bracket 6| secured tonne-side wall I! of the-base. The bracket -'6I hasa depending arm :52 the lower end=53 of which is extended horizontallyiand carriesahand screw. 54. cooperable with the screw 64 is a quadrant plate 65 rigidly secured to the work rest 56 the said plate having an arcuate slot 66 through which the screw 64 extends. By tightening the screw =64 the "quadrantplate B5 is clamped firmly to the arm 62 so that the work rest 56 is held against movement. Upon the screw 84 being loosened, the work rest 56 may be moved through an are about the pivot pin 60, and the angularity of the rest may be indicated by indicia 6! on the plate-65.

The hand screw iifl serves a double purpose. It not only clamps the plate 65 to the arm '52t0 lock the work rest in adjusted position, 'blu'tit also prevents the work rest from separating from the base it], since it prevents relative movement between the extension 59 and bracket B l axially oi the .p'i-vo't pin Bil. The latter may be fixed'to either the said extension or -the bracket; and will thus be retained in" pro'perflposit'ionl However, when itkis desired to remove the work rest 55 from the base, this may be quickly accomplished by merely first removing the hand screw '54., whereupon the work rest may be shifted forwardly so that it will disengage the pivot pin Gil from either the extension 59 or'brac'ket'fil.

By the above construction perpendicular or angular surfaces of workpieces may b'e'quickly and accurately 'fin is'hed by sanding. Desired angles may be obtained'through use 'of the mitre head 5?, or by tilting the work rest 56, or by a combination of both, and this organization in conjunction with the sanding drum 1'8 enables mostsa'ndin'g operations on a workpiecetobe perform'e'd'with ease and accuracy.

Variations and modifications may be made within'the scope'of this invention and portions of the improvements may be used without others.

We claim:

1. In a'sanding machine, a cylindrical drum having a longitudinal recess in its outer surface, extending substantiallyffrom end to end and having shoulders in'said recess; a pair of cooperable clamping strips securing between them the edges of sandpaper wrapped around the drum, the said strips occupying the drum recess in superposed relation, the clamping stripsfhaving a thickness that the surface of the outer strip lies in the cylindrical surface defined by the sandpaper when said shoulders are engaged; yield-able means holding the inner strip in extended position in the recess wherebyth'e'said shoulders are separated from eachother; and clamping means for forcing the saidstr'ips together and 'forcing said shoulders into 'engagement'with each other, the said y-ieldable means opposing the clamping means in a manner that the strips are first brought together to seize the sandpaper between them and then moved simultaneously inward whereby the said-shoulders engage each other and prevent further inward movement of the strips.

'2. In a sanding machine, a cylindrical drum having a longitudinal recess in its outer surface, extending substantially from end to end; a pair of cooperable clamping strips securing between them the edges of sandpaper wrapped around the drum, the said strips occupying the drum recess and one strip lying outside of the other; and spring means between the strips for separating the same when the sandpaper is being released. e

3. In a sanding machine, a cylindrical drum having a longitudinal recess in its outer surface, extending substantially from end to end; a pair of cooperable clamping strips securing between them the edges of sandpaper wrapped around the drum, the said strips occupying the drum recess and one strip lying outside of the other; spring means between the strips for separating the same when the sandpaper is being released; and stronger spring means between the inner clamping strip and the drum for moving the strips outwardly of the recess when the sandpaper is being released;

4. In a sanding machine, a cylindrical sheetmetal drum having adjacent longitudinal edges spaced from each other; a channel strip within the drum, having its edges respectively secured to the longitudinal edges of the drum, the said strip thereby forming a longitudinal recess in the drum surface; threaded nuts carried in the channel strip, the side walls of the latter having lanced fingers overlying the nuts to prevent their being lifted out of the strip; a pair of cooperable clamping strips for securing between them the edges of sandpaper wrapped around the drum, the said strips being located one outside of the other, and extending along the said longitudinal recess, and the inner clamping strip being of channel shape, and receiving a portion of the outer strip; screws passing through the clamping strips and into the said nuts for drawing the strips into the recess of the drum and clamping the edges of the said sandpaper; and spring means between the clamping strips for separating the latter when the screws are loosened.

5. In a sanding machine, a cylindrical sheetmetal drum having adjacent longitudinal edges spaced from each other; a channel strip within the drum, having its edges respectively secured to the longitudinal edges of the drum, the said strip thereby forming a longitudinal recess in the drum surface; threaded nuts carried in the channel strip, the side walls of the latter having lanced fingers overlying the nuts to prevent their being lifted out of the strip; a pair of cooperable clamping strips for securing between them the edges of sandpaper wrapped around the drum, the said strips being located one outside of the other, and extending along the said longitudinal recess, and the inner clamping strip being of channel shape, and receiving a portion of the outer strip; screws passing through the clamping strips and into the said nuts for drawing the strips into the recess of the drum and clamping the edges of the said sandpaper; spring means between the clamping strips for separating the latter when the screws are loosened; and spring means between the inner clamping strip and the channel strip for moving the strips outwardly of the recess upon the screws being loosened.

6. In a sanding machine, a cylindrical sheetmetal drum having adjacent longitudinal edges spaced from each other; a channel strip within the drum, having its edges respectively secured to the longitudinal edges of the drum, the said strip thereby'forming a longitudinal recess in the drum surface; threaded nuts carried in the channel strip, the side walls of the latter having lanced fingers overlying the nuts to prevent their being lifted out of thestrip; a pair of cooperable clamping strips for securing between them the edges of sandpaper wrapped around the drum, the said strips being located one outside of the other, and extending along the said longitudinal recess, and the inner clampingstrip being of channel shape, and receiving a portion of the outer strip; screws passing through the clamping strips and into the said nuts for drawing the strips into the recess of the drum and clamping the edges of the said sandpaper; spring means between the clamping strips for separating the latter when the screws are loosened; and springs means between the inner clamping strip and the channel strip for moving both strips outwardly of the recess upon the screws being loosened, the last-named spring means being stronger than the first-named spring means and causing the clamping strips to first move simultaneously outward of the recess prior to their becoming separated.

7. In a sanding machine, a rotary drum having sandpaper disposed around its surface; a table movably mounted adjacent the drum, for supporting workpieces; and means including a manually operable cam lever, for shifting the table relative to the drum for adjustment purposes and manually operable means acting on the cam lever for locking the lever in different adjusted positions.

8. In a sanding machine, a rotary drumhaving sandpaper disposed around its surface; a table movably mounted adjacent the drum, for supporting workpieces; means for locking the table in any of a number of adjusted positions, the said means including a lug on the table, and including a pair of members engageable with the lug for clamping the latter, one of the said members comprising a manually operable cam for shifting the table relative to the drum for adjustment purposes; and a spring between the clamping members for automatically spreading the latter when the said locking means is released.

ADOLPHE LOUCONY. HARRY EICK.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 40,546 Ball Mar. 10, 1863 100,503 Chapman Mar. 8, 1870 273,970 Doane Mar. 13, 1883 425,376 Forbes Apr. 8, 1890 525,087 Schinitt Aug. 28, 1894 533,707 Fuller et al Feb. 5, 1895 541,349 Gardner June 18, 1895 720,912 Gorton Feb. 17, 1903 950,527 Avram Mar. 1, 1910 1,162,098 'Paszkiewicz Novf30, 1915 1,188,808 Mitchell June 27, 1916 1,682,013 Leonard Aug. 28, 1928 2,169,954 King Aug. 15, 1939 

